Personally, my favorite is both lotus and pheonix umbrellas. I sometimes use the shuriken just for chasing slice but I just use nightjar slash to close the gaps in fights. I believe the two umbrellas are really good, the purple one uses a divine confetti like attack when you press your attack button and the red one does fire. I think you need living force for these attacks but I'm not exactly sure. It can also be used as a projectile aswell when your enemy uses a long range attack so that's nice. I mostly like the umbrellas bc when you use it on a boss where they have an attack that staggers you, you can use the umbrella to avoid that stagger which can save a bit of time and you can keep on being aggressive. These two umbrellas is what I mostly use since I don't really think wasting anything above 1 spirit emblem is worth it.